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  4. 支援QOS路由器的封包排程與服務分流之設計與實作
 
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支援QOS路由器的封包排程與服務分流之設計與實作

Other Title
Design and Implementation of Packet Scheduler and Service Classifier for QoS Router
Date Issued
1999
Date
1999
Author(s)
孫雅麗  
DOI
882219E002008
URI
http://ntur.lib.ntu.edu.tw//handle/246246/18801
Abstract
As the Internet continues to grow in terms of the amount of traffic and the number of users, there are currently a lot of interests in providing multimedia communication services. Many of these new applications rely on the ability of the networks to provide QoS guarantees typically in the form of bounded end-to-end delay, bandwidth and delay jitter. In this paper, we propose a new scheduling algorithm called Maximum Jitter First (MJF) algorithm. It is a frame-based weighted-fair queueing algorithm. Different from WFQ and WF 2 Q, the algorithm uses delay jitter to describe the timestamps of the packets and to assign service order between flows within a frame. Slots assigned to a flow are spaced out within the frame so to minimize the Worse-case Fair Index and to achieve minimal delay jitter for packets of a flow. It as well possesses the bounded-delay and fairness properties. Furthermore, in MJF, the service order is calculated only upon call arrival and departure. It therefore has O(1) computational cost. In order to allow various classifier and scheduling policies to be examined and evaluated, a QoS router is prototyped. Currently, two scheduling algorithms: priority queueing and WFQ and a simple classifier based on “per-flow queueing” and the “Type of Service” field, have been implemented. We also conducted a number of experiments to evaluate the performance of the prototype in QoS provisioning.
Subjects
QoS
Scheduling
Frame-based Queueing, Delay Jitter
packet scheduler
packet classifier
Publisher
臺北市:國立臺灣大學資訊管理學系暨研究所
Type
other
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